Improved pitman-



TBD STATES sALBM T. LAMB7 or NBw ALBANY, INDIANA.

IMPROVED Pl-TIVIAN-.GONNECTION Specification formingpart ofLetter'sPatcntNo. 100,157, dated February 22, 187.

To all whom it 'may concern:

Be it known that I, SALEM T. LAMB, of New Albany, in the county of Floydand State of Indiana, have invented a new and useful 11nprovement inPitmen-Connections; and I do hereby declare the following to be a full,clear, and exact description of the same, reference being had to theaccompanying drawings, in which- Figure l is a side elevation of myinvention attached to the heel of a harvester-cutter. Fig'. 2 is a planof the end of the pitman. Fig'. 3 is a bottom plan of the nut for thesame.

Fig. et is a longitudinal section of same joint.

Fig. 5 is a plan showing joint complete. Figs. 6 and 7 show innersurface of the parts of same joint; Fig. 8, outer surface of loose capwith its bolt; Fig. 9, wrist-pin detached from crankwheel; Fig. l0,vertical longitudinal section through crank joint; Fig. ll, plan of samejoint; Figs. l2 and 13, inner surfaces of parts of same joint; Figs. 14and l5, outer surfaces of same parts; Fig. 16, clamp-bolt belonging' tosaid joint.

This invention relates to that class of connecting-joints which areflexible in lateral directions, so that the operation of the joint shallnot be impaired by slight changes in the relative lines of motion ofcutters and pitman and it specially consists in the manner ofconstructing and attaching the various parts of a ball-and-socket joint.

That others may understand the construction and operation of myinvention, I will particularly describe its various parts.

A is the cutting apparatus, to the heel B of which is attached a ball,C, by means of a short neck, E, which is rigidly attached to the heel Bby some one of the well-known methods. The ball C is made as nearly aspossible truly spherical, and is fitted to a correspondinglyshapedsocket at the end of the pitman.

As the cutter A moves back and forth in the operation of cutting thegrass, the pitman will not only move in the ordinary way, in obedienceto the revolution of the crank, but it may at the same time move in alateral direction, without cramping the joint to accommodate anyirregular or lateral movements of the cutting apparatus, which woulddestroy the parallelism of the line of motion of cutters and pitman. Theabove-mentioned irregular movements of thecutting apparatus veryfreqlfntly occur in consequence of loose jointsat the iuner shoe,springing of braces, Snc., and it is of the highest importance toprovide against any cramping effect in the pitman-joint, and theball-and-socket joint is the most perfect and satisfactory in itsoperation, though more costly than some other forms.

The socket in the end of the pitman is formed in two parts, F and G, thelatter being separate from the pitman, and held in position thereon bymeans of the tightening-bolt H and the iiange I, which is formed acrossthe inner end of G, and is fitted in a groove cut across the face of thepitman, as shown in the drawing; but this would not absolutely preventthe cap G from slipping sidewisein the groove above mentioned. So ashort stud, J, is made a part ofthe flange I, and the same is insertedin a recess bored for it in the center of the groove above mentioned.

The tightening-bolt H is provided with a head, of such shape that wheniitted to a corresponding seat in the cap G the operation of thetightening-nut K will not cause the bolt H to turn in its seat. This isnecessary, not only to insure the proper action of the nut K, but tovprevent the loosening' of the joint by reason of the jarring of theparts during operation; and to preventa like action of the nut, aspringpawl, L, is placed beneath the nut K, in a recess made in thebottom face of the said nut for that purpose, and properly securedthere.

As the nut is screwed onto the bolt, the free end of the pawl L engageswith the teeth of the ratchet M made in the face, against which the nutacts.

These teeth may be formed upon an annular ridge proj ecting intoacorresp ondin g groove in the bottom of the nut, or they may bedepressed below the surface so as to form an annular toothed grooveabout the bolt H. These different modes of construction are shown inFigs. 2 and 4 and Figs 10 and l5.

The free end of the pawl L is provided with a stud, N, which projectsupward andalongside of the hexagonal portion of a nut.

The stud N is provided with a head at its upper end, and when the nut ist0 be run backward on the screw, the stud N must iirst be drawn upwardso as to slip the edge of its head over the edge of the` nut, as shownin Figt, and the paWl will thus be Withdrawn from engagement With theteeth M, and so retained While the nut is being rotated.

It is evident that the saine construction of joint is equally applicableand will be equally useful if applied at the crank-Wrist end of thepitman, and accordingly in Figs. 10 and 11 it is shown as so arranged.

The Wrist-pin E is formed with a flange, beveled at the back, as shownat o, Fig. 9, and this conical part is seated in a corresponding conicalseat, so that the tighteningv and holding nut at the end of said pinWill press the conical flange into itsseat, and will thus render anydisplacement impossible.

By projecting the Wrist-ball C from one side of the knife-heel, thepitman is enabled to act in a line which may represent the line ofequilibrium of the cutters-that is, the line on each 3. The Wrist-pin E,constructed with the,f

conical flange O, to lit a corresponding seat, as and for the purposeset forth and described.

SALEM T. LAMB.

Witnesses:

WM. T. STILLWELL, THOMAS COLLIER.

